Overview
Organized by machine system, the Volvo L120C Wheel Loader Service Repair Manual brings together the technical references used in maintenance and repair work. Its service groups address engine systems, power transmission, braking equipment, and steering components.
The contents also identify differential-lock controls, transfer gearbox components, cooling-system components, turbocharger components, and supplementary steering.
Table of Contents
Volvo L120C Manual
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01. General
- Specifications — Volvo standard tightening torques
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02. Standard Parts, Service
- Lubricant; Fuel; Other Fluid
- Service — Emergency measures — Manual release of parking brake
- Service — Emergency measures — Removing propeller shafts
- Service — Miscellaneous
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03. Engine with Mounting and Equipment
- General, engine installation and its function
- Engine — General, common info about 211 – 218
- Engine — Valve mechanism
- Lubricating System — General, common info about 221 – 224 — Specifications, tightening torques
- Lubricating System — Oil pump; line — Oil pump, removing and installing
- Fuel System — General (common info about 233 – 238)
- Fuel System — Fuel pump; filter; strainer — Feed pump, checking feed pressure
- Fuel System — Fuel tank; fuel filling pump — Fuel tank, removing and installing
- Fuel System — Injection pump; regulator; pump companion — Idling speed, checking and adjusting
- Fuel System — Injector; delivery pipe
- Inlet System; Exhaust System — Turbo charger
- Inlet System; Exhaust System — Air cleaner with connections; air pre-heater
- Inlet System; Exhaust System — Charge air cooler with connections
- Cooling System — General, common info about 261 – 269
- Cooling System — Coolant pump; thermostat — Coolant pump for intercooler, reconditioning
- Cooling System — Coolant pump; thermostat — Coolant pump for intercooler, removing and installing
- Cooling System — Coolant pump; thermostat — Coolant pump, removing and installing
- Engine Control — Stop control — Stop solenoid, adjusting stroke (solenoid positioned on inside of the radiator “bow”)
- Engine Control — Stop control — Stop solenoid, adjusting stroke (Solenoid positioned on the engine)
- Engine Control — Stop control — Stop solenoid, fault-tracing tips
- Engine Control — Cold start control
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04. Elec. System; Warning System; Information System; Instruments
- Comprehensive info, electrical system — Special instructions for working on the electrical system
- Battery; Energy Storage System; Mounting Parts — Battery — Safety when working with batteries
- Alternator; Charging; Electric Motor; Electric Drives — General, common info about 321 – 322
- Alternator; Charging; Electric Motor; Electric Drives — Alternator inclusive drive — Alternator 100 A, checking and adjusting voltage
- Starting System — Starter motor inclusive solenoid
- Lighting — General, common info about 351 – 356
- Lighting, front, including parking light and day running light
- Other Electrical Equipment — Automatic control/blocking function, lacking a function group of its own — General description of the control unit (ECU)
- Other Electrical Equipment — Automatic control/blocking function, lacking a function group of its own — Other electrical functions (controlled by the control unit)
- Cable; Fuse; Relay — General, common info about 371 – 379 — Codes used in wiring diagrams
- Cable; Fuse; Relay — General, common info about 371 – 379 — Explanations of wiring diagrams (lead and component marking)
- Cable; Fuse; Relay — General, common info about 371 – 379 — Loud tone horn∗, seat with air suspension∗
- Cable; Fuse; Relay — General, common info about 371 – 379 — Wiring diagram, circuit 16:1 — 16:8
- Cable; Fuse; Relay — General, common info about 371 – 379 — Wiring diagram, circuit 17:1 — 17:5
- Cable; Fuse; Relay — General, common info about 371 – 379 — Wiring diagram, circuit 18:1 — 18:8
- Cable; Fuse; Relay — Electrical distribution box; fuse box; junction box — Electrical distribution box
- Instrument; Sensor; Warning and Information System — General, common info about 383 – 387
- Instrument; Sensor; Warning and Information System — Sender, monitoring system — Air conditioning, pressure monitor, SE22, checking
- Instrument; Sensor; Warning and Information System — Sender, monitoring system — Air conditioning, thermostat, SE21, checking
- Instrument; Sensor; Warning and Information System — Sender, monitoring system — Axle oil temperature, SE84 and SE84, checking
- Instrument; Sensor; Warning and Information System — Sender, monitoring system — Engine temperature, SE1, checking
- Instrument; Sensor; Warning and Information System — Sender, monitoring system — Transmission oil temperature, SE11, checking
- Instrument; Sensor; Warning and Information System — Warning/information unit, display unit — Contronic Service Display Unit
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05. Power Transmission
- General, common info about 410 – 436
- Clutch; Torque Converter — Clutch control, manual or fixed
- Clutch; Torque Converter — Hydrodynamic coupling, torque converter
- Transmission, Hydraulic Control — Specifications, capacities (dm³ = litre)
- Transmission, hydraulic control — Transmission, checking oil pressure
- Gearbox — Distributing gearbox — Specifications, capacities (dm³ = litre)
- Front Axle; Rear Axle — General, common info about 461 – 468 — Rear axle suspension, measuring axial and radial clearance
- Front Axle; Rear Axle — General, common info about 461 – 468 — The axial clearance of the rear axle bridge, adjusting
- Front Axle; Rear Axle — General, common info about 461 – 468 — Wear ring (differential carrier assembly), replacing
- Front Axle; Rear Axle — Front axle — Specifications, capacities (dm³ = litre)
- Front Axle; Rear Axle — Rear axle 1 — Specifications, capacities (dm³ = litre)
- Front Axle; Rear Axle — Differential lock, with control
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06. Brake
- Comprehensive info about brakes
- Wheel Brake — General, common info about 511 – 519 — Brake discs, checking wear (with built-in wear indicator)
- Wheel Brake — General, common info about 511 – 519 — Brake discs, checking wear (without built-in wear indicator)
- Hydraulic Brake System — General, common info about 520 – 522 — Checking function
- Hydraulic Brake System — General, common info about 520 – 522 — Foot brake pedal, adjusting angle and pedal free travel
- Hydraulic Brake System — General, common info about 520 – 522 — Pressure in circuit, checking and adjusting
- Hydraulic Brake System — Brake valve — Foot brake valve (removed), reconditioning
- Hydraulic Brake System — Brake accumulator; hydraulic pump — Accumulator, checking (removed)
- Parking Brake — General, common info about 551 – 554 — Parking brake (mechanically operated), checking and adjusting
- Parking Brake — General, common info about 551 – 554 — Parking brake, replacing discs
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07. Steering
- Comprehensive info, steering
- Steering — General, common info about 641 – 647 — Hydraulic diagram, lever steering (CDC)∗ and secondary steering∗
- Steering — Hydraulic equipment — Shift valve, reconditioning (removed)
- Steering — Hydraulic equipment — Shift valve, description
- Steering — Hydraulic equipment — Stand-by pressure and working pressure, checking and adjusting
- Steering — Hydraulic equipment — Steering pump, reconditioning (removed)
- Steering — Hydraulic equipment — Steering valve, reconditioning (removed)
- Steering — Supplementary steering
- Lever steering, adjusting steering speed
- Lever steering, checking and adjusting control valve
- Lever Steering — Steering lever CU3, checking input/output voltage
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08. Frame; Springs; Damping; Axle Suspension; Wheel/track Unit
- Comprehensive info about frame and track unit/wheels
- Frame, complete
- Frame — Protection; belly plate; bumper
- Frame — Counterweight
- Frame — Specifications, tightening torques
- Frame Link — Bearings — Frame joint, replacing bearings
- Wheels; Tracks; Tyre; Hub; Drum — Wheel
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09. Machinery House; Cab; Exterior Trim Parts Anywhere
- Cab, Naked; Canopy
- Trim Part, Outside; Glass; Sealing Moulding — Glass; sealing moulding — Rear window, sealing
- Trim Part, Outside; Glass; Sealing Moulding — Glass; sealing moulding — Windscreen side pane, replacing and sealing
- Trim Part, Outside; Glass; Sealing Moulding — Glass; sealing moulding — Windscreen, replacing and sealing
- Trim Part, Outside; Glass; Sealing Moulding — Glass; sealing moulding — Windscreen, sealing
- Air Conditioning Unit — General, common info about 872 – 877
- Air Conditioning Unit — Air distribution incl. air intake with filter
- Air Conditioning Unit — Cooling unit — Air conditioning, performance test
- Air Conditioning Unit — Cooling unit — Electrical system, air conditioning, description of function
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10. Hydraulic System; Digging/ Handling/ Grading Equipm.; Misc. Equip.
- Working Hydraulics; Servo Hydraulics — General, common info about 911 – 917 — Hydraulic diagrams, working hydraulics
- Working Hydraulics; Servo Hydraulics — Working hydraulics — Shock and anti-cavitation valve
- Working Hydraulics; Servo Hydraulics — Pump, working hydraulics — Working pressure, checking and adjusting
- Working Hydraulics; Servo Hydraulics — Servo hydraulic system — Pressure back-up for servo circuit, accumulator checking
- Working Hydraulics; Servo Hydraulics — Servo hydraulic system — Servo pressure, checking and adjusting (machine without separate attachment locking)
- Working Hydraulics; Servo Hydraulics — Servo hydraulic system — Servo pressure, checking and adjusting (machine with separate attachment locking)
- Working Hydraulics; Servo Hydraulics — Servo hydraulic system — Servo pressure, checking at spool in control valve
- Working Hydraulics; Servo Hydraulics — Servo hydraulic system — Servo valve, description of function
- Working Hydraulics; Servo Hydraulics — Servo hydraulic system — Servo valve, operating controls, adjusting
- Working Hydraulics; Servo Hydraulics — Other hydraulic equipment — 4th hydraulic function, description
- Working Hydraulics; Servo Hydraulics — Other hydraulic equipment — Accumulator for Boom Suspension System, releasing pressure
- Working Hydraulics; Servo Hydraulics — Other hydraulic equipment — Accumulator, Boom Suspension System, reconditioning
- Working Hydraulics; Servo Hydraulics — Other hydraulic equipment — Accumulator, precharging pressure, checking and adjusting
- Working Hydraulics; Servo Hydraulics — Other hydraulic equipment — Boom Suspension System, checking
- Working Hydraulics; Servo Hydraulics — Other hydraulic equipment — Pressure-reducing valves R1 and R2, closing pressure, checking
- Working Hydraulics; Servo Hydraulics — Other hydraulic equipment — Releasing the hydraulic oil pressure in the accumulator
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Boom kick-out and bucket positioner, adjusting
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Lifting arm, replacing bearings at lower bucket or attachment mounting
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Lifting cylinder, changing seals in machine
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Lifting cylinder, replacing bushings (removed)
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Lifting/tilting cylinder, (principle diagram)
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Shock valve, lifting function, checking and adjusting
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Shock valve, tilting function, checking and adjusting
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Tilting cylinder, changing seals in machine
- Unit, Load Handling — Lifting frame work with mounting and link arm system — Tilting cylinder, replacing bearings (removed)
Lifting Frame and Hydraulic Component References
The associated entries are “Boom kick-out and bucket positioner, adjusting” and “Lifting arm, replacing bearings at lower bucket or attachment mounting”.
Keep the mechanical handling assembly separate from its working-hydraulics references when locating a component or repair topic.
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